java.lang.NullPointerException
   at org.netbeans.modules.maven.nodes.ModulesNode$ModulesChildFactory.createNodeForKey(ModulesNode.java:193)
   at org.netbeans.modules.maven.nodes.ModulesNode$ModulesChildFactory.createNodeForKey(ModulesNode.java:141)
   at org.openide.nodes.ChildFactory.createNodesForKey(ChildFactory.java:120)
   at org.openide.nodes.AsynchChildren.createNodes(AsynchChildren.java:160)
   at org.openide.nodes.Children$Keys$KE.nodes(Children.java:1662)
   at org.openide.nodes.ChildrenArray.nodesFor(ChildrenArray.java:149)
   at org.openide.nodes.EntrySupportDefault$Info.nodes(EntrySupportDefault.java:805)
   at org.openide.nodes.EntrySupportDefault.updateAdd(EntrySupportDefault.java:441)
   at org.openide.nodes.EntrySupportDefault.setEntries(EntrySupportDefault.java:295)
   at org.openide.nodes.EntrySupport.setEntries(EntrySupport.java:83)
   at org.openide.nodes.Children$Keys$2.run(Children.java:1556)
   at org.openide.util.Mutex$1Exec.run(Mutex.java:1259)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1921)
   at org.openide.util.Mutex.postRequest(Mutex.java:1265)
   at org.openide.util.Mutex.postRequest(Mutex.java:1228)
   at org.openide.util.Mutex.postWriteRequest(Mutex.java:592)
   at org.openide.nodes.Children$Keys.applyKeys(Children.java:1565)
   at org.openide.nodes.Children$Keys.setKeys(Children.java:1509)
   at org.openide.nodes.AsynchChildren$1.add(AsynchChildren.java:190)
   at org.netbeans.modules.maven.nodes.ModulesNode$ModulesChildFactory.createKeys(ModulesNode.java:177)
   at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:209)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)